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Sensor Circuit Calibration using a DAC
Setting the DC Set Point for Sensor Circuit
A common DAC application is digitally controlling the set
point and/or calibration of parameters in a signal chain. The
?gure below shows controlling the DC set point of a light
detector sensor using the MCP4728 12-bit quad DAC device.
The DAC provides 4096 output steps. If G = 1 and internal
reference voltage options are selected, then the internal
2.048 V REF would produce 500 μV of resolution. If G = 2 is
Setting the DC Set Point
selected, the internal 2.048 V REF would produce 1 mV of
resolution. If a smaller output step size is desired, the output
range would need to be reduced. So, using gain of 1 is a
better choice than using gain of 2 con?guration option for
smaller step size, but its full-scale range is one half of that
of the gain of 2. Using a voltage divider at the DAC output is
another method for obtaining a smaller step size.
Light
V DD
Comparator 1
R SENSE
R 1
V TRIP1
R 2
0.1 μF
MCP6544(1/4)
V DD
Light
R SENSE
V DD
Comparator 2
0.1 μF
10 μF
R 1
V TRIP2
R 3
R 2
0.1 μF
MCP6544(2/4)
R 5
R 4
V DD
SCL
1
2
10
9
V SS
V OUT D
R 6
SDA
3
MCP4728
8
V OUT C
LDAC
RDY/BSY
4
5
7
6
V OUT B
V OUT A
Light
V DD
Quad DAC
To MCU
Analog Outputs
R 1
R SENSE
V TRIP3
Comparator 3
R 2
0.1 μF
MCP6544(3/4)
V TRIP = V OUT x R 1 + R 2
V OUT = V REF x Dn G X
4096
R 2
Where Dn = Input Code (0 to 4095)
Light
R SENSE
R 1
V DD
V TRIP4
Comparator 4
G X = Gain Selection (x1 or x2)
R 2
0.1 μF
MCP6544(4/4)
Signal Chain Design Guide
15
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